Takashima, Yuusuke Tokushima University Tokushima University Educator and Researcher Directory
Moriiwa, Kouhei Tokushima University
Haraguchi, Masanobu Tokushima University Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Naoi, Yoshiki Tokushima University Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Magnetic field sensor
ferromagnetic subwavelength grating
surface plasmon polariton
A sensitive optical magnetic field sensor was experimentally demonstrated using Ni-subwavelength grating (SWG) combined with a SiO2/Ag plasmonic structure. We fabricated the Ni-SWG structure on the Ag/SiO2 structure using electron beam lithography and a liftoff process. As a result, a dip in the reflection spectra with normal incidence was obtained at a wavelength of 530 nm. The reflectivity at the dip position significantly decreased with the intensity of the magnetic field applied to the structure. When a magnetic field of 43 mT was applied, the change in reflection reached approximately 4% of that without magnetic field. The experimental results indicate that our sensor achieves millitesla order of sensitivity for the magnetic field. The electromagnetic field distribution around the Ni-SWG/SiO2/Ag calculated using the finite-difference time-domain method clarified the reason for the high sensitivity of our sensor.
Proceedings of SPIE
Yuusuke Takashima, Kouhei Moriiwa, Masanobu Haraguchi, Yoshiki Naoi, "Ni subwavelength grating/SiO2/Ag based optical magnetic field sensor with normal incident geometry," Proc. SPIE 11089, Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XVI, 110891V (3 September 2019); doi: https://doi.org/10.1117/12.2529017
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